Artikel i vetenskaplig tidskrift, 2016

Using bonded fibre-reinforced polymer (FRP)
laminates for strengthening wooden structural members has
been shown to be an effective and economical method. In
this paper, properties of suitable FRP materials, adhesives
and two ways of strengthening beams exposed to bending
moment are presented. Passive or slack reinforcement is
one way of strengthening. The most effective way of such a
strengthening was to place reinforcement laminates on both
tension and compression side of the beam. However, the
FRP material is only partially utilised. The second way is
to apply pre-stressing in FRP materials prior to bonding to
tension side of flexural members and this way was shown
to provide the most effective utilisation of these materials.
The state of the art of such a strengthening and various
methods are discussed. Increasing the load-bearing capacity,
introducing a pre-cambering effect and thus improving
serviceability which often governs the design and reducing
the amount of FRP reinforcement needed are some of the
main advantages. A recent development on how to avoid
the requirement for anchoring the laminates at the end of
the beams to avoid premature debonding is shown, and the
advantage of such a system is described.